[pianotech] glue and screws - was Wood? - straightening...

[Al Guecia/Allied PianoCraft]

Thump, they were always arms to me, until I moved to N.C., but they also say ya'll.

Al -
High Point, NC



On Jul 1, 2012, at 12:25 PM, Euphonious Thumpe wrote:

O.K.. I can appreciate that epoxy and old glues don't mix....... but TitebondIII? I've found it to stick astonishingly well to everything, including pants that have been washed 100 times since extensively slobbered with it during a player piano side-regluing. (I was on my back under the piano.) And it has the water in it needed to melt old hide glue, a bit. If someone has had direct experience with this alleged non-adhesiveness, or can direct me to serious documentation (in Fine Woodworking, perchance?) that it works less well than new hide glue on old, I'll be more fully convinced. 

Regards,
Thumpe

P.S. To Joe --- concerning piano case nomenclature: I've always referred to those parts of a piano as its "cheeks", but after describing my repair problem with a long-time tech ( who will remain nameless) who could not figure out what I was referring to, he said "Do you mean the "arms"?" , which term I "picked up" and then passed on to you. (My apologies.)

From: Ron Nossaman <rnossaman at cox.net>; 
To: <pianotech at ptg.org>; 
Subject: Re: [pianotech] glue and screws - was Wood? - straightening... 
Sent: Sun, Jul 1, 2012 9:14:11 AM 

On 6/30/2012 8:20 PM, Joseph Garrett wrote:

> O.K.? Would you be specific? Where are they useable in pianos? <G>

Well, for instance I've never used anything but sheetrock screws when gluing bridges to soundboards, and never will. I've also installed a lot of cutoff bars with combinations of sheetrock screws and dowels. All of the many jigs I've built through the years, if they contain screws at all, are put together with sheetrock screws. I use conventional wood screws only when replacing conventional wood screws with new, as in action flange screws and plate webbing.


> I would say that Sheet Rock Screws are good for many things other than
> sheet rock. However, they have one flaw, (my perception), the threads go
> all the way to the head, which makes it near-impossible to pull two pieces
> together, unless you strip one side. This tends to make the user want to
> over-cinch them and then they break.

A trip to the hardware store to actually look at what's for sale will show you that they aren't necessarily threaded full length. Even so, it's incumbent on the user to make some attempt to learn to sensibly install any type of screw or bolt.



> Including epoxy, nor will any glue at all bond with the more modern
> glues when the joint fails, whatever you do.
> 
> Totally agree. Especially all of the "experimental glues" that seem to make
> their way into the newer stuff, (post WWII and beyond!) Really creates some
> interesting problems to be sure.<G>

The point is that people typically assume that epoxy is the way to go when they want a strong bond, but epoxy is universally incompatible with any existing glue residue.

Ron N

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